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While Paul may be the most libertarian-minded candidate in the field of prospective GOP presidential candidates, Johnson said, Paul doesn't fit the libertarian mold on a host of issues: from abortion to marriage equality to immigration and marijuana.

"He's a Republican," Johnson said.

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"Great, I mean terrific," Johnson said sarcastically. "I mean, the most libertarian candidate that Republicans may end up fielding."

Paul has even sidled away from his libertarian foreign policy views, ​shying away from his isolationist views in favor of a more nuanced foreign policy that would better fit the mold of a Republican primary.